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Cobra Forums
2013-14 Shelby GT500
Advice on upcoming mods.
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<blockquote data-quote="Jam421" data-source="post: 16420620" data-attributes="member: 110985"><p>CobraKid.....After driving thru winter gas without any boost...on fill up I use one bottle of VP Octanium on first summer tank . Like Boostane...VPO is 8#'s up when mixed with 10 gallons. When I'm at 1/4-1/3 tank refills I add only 1/2 bottle VPO during each of those subsequent fill up. To best of my figuring that's 96-98 Octane mixed with pump 93 in my car at all times. My car runs differently with the VPO. I feel it ! And...my Lund Data logs showed 1-2 degrees timing added by the ECU ..at peak power bands......with VPO. I just ordered ...going to try ...the new VPO Unleaded from Amazon. If you do the 2.4 upper ..even with headers.....most would recommend NGK 7( or equivalent) heat range plugs. My 7's are orange from the VPO which is no consequence . I love the stuff & it's way worth an extra $300 per season. </p><p></p><p>Regarding the gears ...with the 29" wheel you're really around a 3.90 rear gear. I have the same set up. Be sure your tuner adjust your speedo for 3.90 ratio. Mine were set to 4.10 and I noticed on GPS my speedo was 5mph off. Lund factored the taller 305 MT's + 4.10 gear to make the correction. The beauty of gear is an amazing 3rd gear burst, faster revs, quicker to the boost + the ability to use 6th gear on highways.</p><p>If/when you dyno with the 4.10's you may be giving up 10-15rwhp on the dyno vs 331's. That's a mystery for the experts <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />->). But 410's will feel like holding the tail on a lightning bolt.</p></blockquote><p></p>
[QUOTE="Jam421, post: 16420620, member: 110985"] CobraKid.....After driving thru winter gas without any boost...on fill up I use one bottle of VP Octanium on first summer tank . Like Boostane...VPO is 8#'s up when mixed with 10 gallons. When I'm at 1/4-1/3 tank refills I add only 1/2 bottle VPO during each of those subsequent fill up. To best of my figuring that's 96-98 Octane mixed with pump 93 in my car at all times. My car runs differently with the VPO. I feel it ! And...my Lund Data logs showed 1-2 degrees timing added by the ECU ..at peak power bands......with VPO. I just ordered ...going to try ...the new VPO Unleaded from Amazon. If you do the 2.4 upper ..even with headers.....most would recommend NGK 7( or equivalent) heat range plugs. My 7's are orange from the VPO which is no consequence . I love the stuff & it's way worth an extra $300 per season. Regarding the gears ...with the 29" wheel you're really around a 3.90 rear gear. I have the same set up. Be sure your tuner adjust your speedo for 3.90 ratio. Mine were set to 4.10 and I noticed on GPS my speedo was 5mph off. Lund factored the taller 305 MT's + 4.10 gear to make the correction. The beauty of gear is an amazing 3rd gear burst, faster revs, quicker to the boost + the ability to use 6th gear on highways. If/when you dyno with the 4.10's you may be giving up 10-15rwhp on the dyno vs 331's. That's a mystery for the experts (:->). But 410's will feel like holding the tail on a lightning bolt. [/QUOTE]
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